Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4970dfb59d116bc…

MALICIOUS

PDF

84.0 KB Created: 2021-08-12 04:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 87a64242de331710d2b8e30b18fa0ac7 SHA-1: 616d5235ab0263df87cd9ab71ff40239ade7c7c4 SHA-256: e4970dfb59d116bc9769663bc958836277f5aa5c50df290bd082c1182984c4fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms, suggesting it's designed to redirect users to malicious content. The presence of JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=reinforcement+and+study+guide+answer+key+biology+chapter+1 PDF link annotation
    • http://liga-stf.ru/i/upload/files/zitebofexanisiwagawawose.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/39776329368.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/4a2672c3e431631966c4ac6e959a0636/93808789764.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/74178296360.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/62081376116.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/47748420269.pdfIn PDF document text
    • http://mweb.cz/images/file/82901154068.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/a5ec2580a4ccf57acb76ee5a4d9387a0/7019571438.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/58973313922.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/edm0a5lbmnuahd2rqh5omkgkg6/79897009081.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/notekabosu.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16097a8852d82d---19103695566.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/gekegozosanud.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/40171921692.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/37995a5b15a3e174fe114cf55cd89cb4/85846889194.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/welevibotipozinebos.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/jasugesupegowedu.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///35886515671.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/12678697303.pdfIn PDF document text
    • https://ocw.tw/uploads/files/bupepemotolexore.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16083a7e89f880---12599625165.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/45211645948.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f58ec54c90---38708158297.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2a60a54e6---40834863369.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF77 17512 bytes
SHA-256: 4be01b7e71738d126566e9c7fc9ffa1a9216eabcd83967d0490a8f2cc6398115
font_01_sfnt_off00010d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B5 11696 bytes
SHA-256: e6e5f50821b8067642617d3c8d9e93c31875f4b3375a79768827340c4dad619b

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